[Bug 1613639] [NEW] apt-add-repository exits 0 even if it can't retrieve key

[Matthew Mosesohn]

Public bug reported:

Example command:
$ sudo apt-add-repository -y ppa:ansible/ansible
gpg: keyring `/tmp/tmp_h1uhhzk/secring.gpg' created
gpg: keyring `/tmp/tmp_h1uhhzk/pubring.gpg' created
gpg: requesting key 7BB9C367 from hkp server keyserver.ubuntu.com
gpgkeys: key 6125E2A8C77F2818FB7BD15B93C4A3FD7BB9C367 can't be retrieved
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0
gpg: keyserver communications error: keyserver helper general error
gpg: keyserver communications error: unknown pubkey algorithm
gpg: keyserver receive failed: unknown pubkey algorithm
$ echo $?
0

The command should exit nonzero if any step was unable to be completed.
Ideally, Ubuntu's keyserver won't fail, but that can't be helped.

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1613639

Title:
  apt-add-repository exits 0 even if it can't retrieve key

Status in software-properties package in Ubuntu:
  New

Bug description:
  Example command:
  $ sudo apt-add-repository -y ppa:ansible/ansible
  gpg: keyring `/tmp/tmp_h1uhhzk/secring.gpg' created
  gpg: keyring `/tmp/tmp_h1uhhzk/pubring.gpg' created
  gpg: requesting key 7BB9C367 from hkp server keyserver.ubuntu.com
  gpgkeys: key 6125E2A8C77F2818FB7BD15B93C4A3FD7BB9C367 can't be retrieved
  gpg: no valid OpenPGP data found.
  gpg: Total number processed: 0
  gpg: keyserver communications error: keyserver helper general error
  gpg: keyserver communications error: unknown pubkey algorithm
  gpg: keyserver receive failed: unknown pubkey algorithm
  $ echo $?
  0

  The command should exit nonzero if any step was unable to be
  completed. Ideally, Ubuntu's keyserver won't fail, but that can't be
  helped.

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